CN104698333A - Method and device for detecting and handling load faults of power amplifier - Google Patents
Method and device for detecting and handling load faults of power amplifier Download PDFInfo
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- CN104698333A CN104698333A CN201510128272.4A CN201510128272A CN104698333A CN 104698333 A CN104698333 A CN 104698333A CN 201510128272 A CN201510128272 A CN 201510128272A CN 104698333 A CN104698333 A CN 104698333A
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Abstract
The invention discloses a method for detecting and handling load faults of a power amplifier. The method comprises the following steps of providing real-time parameters through current and voltage detection, thereby calculating to obtain online power and impedance curve data as the basis of reducing output power or short-circuit protection states. The invention further discloses a device for detecting and handling load faults of the power amplifier, and the device comprises a current detecting module, a voltage detecting module, and a DSP/MCU (digital signal processor/micro controller unit) module. According to the method and the device, when a sound system is installed, and the power amplifier can distinguish whether the load impedance is normal and performs corresponding adjustment, thereby ensuring that the load on the circuit meets the output impedance of the power amplifier; when the sound system is normally used, load power and impedance of the power amplifier are monitored and automatically treated when the output circuit of the power amplifier or a loudspeaker emerges questions. According to the method and the device, the load is automatically disconnected in a short-circuit state and automatically connected after the short circuit is eliminated, the output power is automatically reduced in overload so that the sound cannot be interrupted and the output power can be automatically recovered after the overload is eliminated.
Description
Technical field
The present invention relates to a kind of detection of power amplifier load faulty, countermeasure and device.
Background technology
There is artificial or non-artificial short circuit sometimes or overlap with electrical network or break by large wind or occur the faults such as speaker damage, so the power amplifier on market is nearly all with load short circuit protection function and overload protection function in the outlet line of audio-frequency power amplifier (abbreviation power amplifier).Existing power amplifier product, has individual weak point, after entering guard mode, even if fault eliminates, can not automatically recover, and needs manually to restart power amplifier, and this is in a lot of important events, such as, at unattended machine room, is unacceptable.Be directed to this, after market having occurred enter protection on a small quantity, postpone the power amplifier started with regard to self-recoverage.Problem is, when fault is not got rid of, power amplifier can constantly be attempted starting; as everyone knows, under fault condition, the electric current used when the electric current flowing through power tube all significantly exceedes normal play music; if constantly repeated priming, constantly protects, will damage power tube.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of test countermeasure method and device of power amplifier load faulty, determine whether self-recoverage according to the parameter detected, the present invention adopts following technical scheme in order to achieve the above object:
The detection of power amplifier load faulty, countermeasure: by electric current, a voltage detecting, provide real-time parameter to carry out computing, draws the data at linear heat generation rate, online impedance curve, as whether entering the foundation reducing output power or short-circuit protection state.
Optionally, under power amplifier load circuit is in reduction output power state, double counting, in the data of linear heat generation rate, online impedance curve, recovers normal output power when power amplifier load circuit power is too low.
Optionally, under power amplifier load circuit is in short-circuit protection state, input a test signal in power amplifier load circuit, draw the data of power, impedance curve, when power amplifier load circuit power, impedance curve are normal, power amplifier load circuit starts.
The detection of power amplifier load faulty, a reply device, comprising:
Current detection module: utilize the sampling of resistance tandem or Current Transformer to detect the electric current of power amplifier load circuit, current signal supply DSP/MCU module;
Voltage detection module: the dividing potential drop or the transformer pressure-reducing principle that utilize resistance, supply DSP/MCU module after the voltage signal step-down of power amplifier load circuit;
DSP/MCU module: use the dsp chip of band MCU function or the MCU chip of band A/D input port, the signal that received current detection module and voltage detection module are sent here, through inner computing, draw impedance curve data, power data, obtain failure message with this.
Optionally, measuring signal generator, test signal miniwatt amplification module and change-over switch is also comprised;
Described measuring signal generator is integrated in described DSP/MCU module, and is electrically connected to power amplifier load circuit by test signal miniwatt amplification module and change-over switch.
Optionally, also comprise key-press module, described key-press module is electrically connected with described DSP/MCU module, and for setting power amplifier parameter, or manual triggers detects load parameter.
Optionally, also comprise communication module, described communication module is electrically connected with described DSP/MCU module, for the data upload DSP/MCU module sent here to other machine.
Optionally, the test signal that described measuring signal generator sends is swept-frequency signal or stairstep signal.
Optionally, the frequency test signal that described measuring signal generator sends is 20Hz ~ 20KHz.
Optionally, the test signal that described measuring signal generator sends is pink noise signal.
Test countermeasure method and the device beneficial effect of power amplifier load faulty provided by the invention are:
One. when installing sound system, power amplifier can distinguish that whether the impedance of load is normal, and installation personnel can make corresponding adjustment, ensures that the load on circuit is the output impedance requirement meeting power amplifier.
Two. when sound system normally uses, power and the impedance of power amplifier load can be monitored, can automatically process when the outlet line of power amplifier or loudspeaker go wrong.Automatic disconnecting consumers when comprising short circuit, short-circuit bar is except rear automatic connection load.Automatically reduce output power when also comprising overload, guarantee that sound does not interrupt, and overload recovers output power after getting rid of automatically.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention, in the accompanying drawings:
Fig. 1 is the embodiment of the present invention 1 system architecture schematic diagram;
Fig. 2 is the embodiment of the present invention 2 system architecture schematic diagram.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment:
As shown in Figure 1, a kind of detection of power amplifier load faulty, reply device, comprising:
Current detection module 5: utilize the sampling of resistance tandem or Current Transformer to detect the electric current of power amplifier load circuit, current signal supply DSP/MCU module;
Voltage detection module 6: the dividing potential drop or the transformer pressure-reducing principle that utilize resistance, supply DSP/MCU module after the voltage signal step-down of power amplifier load circuit;
DSP/MCU module 7: use the dsp chip of band MCU function or the MCU chip of band A/D input port, the signal that received current detection module 5 and voltage detection module 6 are sent here, through inner computing, draw impedance curve data, power data, obtain failure message with this.
As the improvement of above-described embodiment scheme, also comprise key-press module 8, described key-press module 8 is electrically connected with described DSP/MCU module 7, and for setting power amplifier parameter, or manual triggers detects load parameter.
As the improvement of above-described embodiment scheme, also comprise state display module 9:DSP/MCU module 7 and the data calculated are delivered to state display module 9 show.
As the improvement of above-described embodiment scheme, also comprise communication module 10, described communication module 10 is electrically connected with described DSP/MCU module 7, for the data upload DSP/MCU module 7 sent here to other machine.
In above-described embodiment scheme, detection, the countermeasure of power amplifier load faulty are as follows:
By electric current, voltage detecting, provide real-time parameter to carry out computing, draw the data at linear heat generation rate, online impedance curve, as whether entering the foundation reducing output power or short-circuit protection state.
Under power amplifier load circuit is in reduction output power state, double counting, in the data of linear heat generation rate, online impedance curve, recovers normal output power when power amplifier load circuit power is too low.
During real-time testing, because with the signal content of 1KHz in the music signal of program source 1 or voice signal, after current detection module 5 and voltage detection module 6, online current signal and voltage signal are delivered to DSP/MCU module 7, filtering operation (FOURIER TRANSFORM) is made in DSP/MCU module 7 inside, extract the sound signal of 1KHz, take advantage of the principle equaling power in voltage according to electric current, calculate the power of 1KHz.According to voltage except the principle equaling resistance value in electric current, calculate the impedance of 1KHz.Other frequency is also same.The data calculated are delivered to state display module 9 and are shown by DSP/MCU module 7, data are delivered to communication module 10, allow communication module 10 send data to other machine.
Embodiment 2
As shown in Figure 1, 2, the power amplifier load circuit in embodiment 2 is identical with embodiment 1, as the improvement of above-described embodiment 1 scheme, also comprises measuring signal generator, test signal miniwatt amplification module 11 and change-over switch; Described measuring signal generator is integrated in described DSP/MCU module 7, the test signal sent is 20Hz ~ 20KHz swept-frequency signal or stairstep signal, 20Hz ~ 20KHz audio-frequency test signal that DSP/MCU module 7 is sent here by test signal miniwatt amplification module 11 carries out miniwatt amplification, deliver to the signal source as test on loaded line, and be electrically connected to power amplifier load circuit by test signal miniwatt amplification module 11 and change-over switch.
If select full range test, 20Hz ~ 20KHz test signal is produced by DSP/MCU module 7, through test signal miniwatt amplification module 11, be switched to using relay 4 as change-over switch on outlet line as test signal, through the detection of current detection module 5 and voltage detection module 6, deliver to DSP/MCU module 7 and do computing, impedance curve data can be calculated thus.Data are delivered to state display module 9 and are shown, and data deliver to communication module 10, allow communication module 10 send data to other machine.
Under power amplifier load circuit is in short-circuit protection state, input a test signal in power amplifier load circuit, draw the data of power, impedance curve, when power amplifier load circuit power, impedance curve are normal, power amplifier load circuit starts.
When the line impedance tested out as DSP/MCU module 7 is not yet recovered normal, relay 4 no longer connects back power amplifier module 3, avoids power amplifier module 3 and constantly occurs restarting and protection act.When outlet line has overload phenomenon, DSP/MCU module 7 pilot relay 4 disconnects, outlet line is connected to test signal miniwatt amplification module 11 through relay 4, DSP/MCU module 7 is according to the result after test, send instruction to volume adjusting IC2, volume adjusting IC2 carries out corresponding volume attenuation, power take-off also reduces output voltage accordingly, outlet line is connected to the output terminal of power amplifier module 3 by DSP/MCU module 7 again pilot relay 4, the voltage exported due to power amplifier module 3 reduces, flow through the electric current also corresponding minimizing of power tube, DSP/MCU module 7 also can not be tested with over-current phenomenon avoidance again, can not the connection of switch-off power amplifier and outlet line, even if thus realization overload also maintains the advantage of voice output, there is overload phenomenon by display module 9 display translation circuit simultaneously, inform that the monitor staff of sound system carries out breakdown maintenance in broadcasting idle.DSP/MCU module 7 also can pass through communication module 10, has the information of overload phenomenon to send other machines to outlet line.
As the partial replacement of above-described embodiment scheme, the test signal that described measuring signal generator sends is pink noise signal.
Utilize music signal to detect in real time, utilize 20Hz ~ 20KHz test signal to detect, both can choose any one kind of them, and respectively have superiority.Or use, then both advantages comprehensive simultaneously.DSP/MCU module 7 also can send other acoustic signal source tests such as pink noise if desired.
Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, embodiment and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the detection of power amplifier load faulty, a countermeasure, is characterized in that comprising the following steps:
By electric current, voltage detecting, provide real-time parameter to carry out computing, draw the data at linear heat generation rate, online impedance curve, as whether entering the foundation reducing output power or short-circuit protection state.
2. the detection of power amplifier load faulty as claimed in claim 1, countermeasure, is characterized in that:
Under power amplifier load circuit is in reduction output power state, double counting, in the data of linear heat generation rate, online impedance curve, recovers normal output power when power amplifier load circuit power is too low.
3. the detection of power amplifier load faulty as claimed in claim 1, countermeasure, is characterized in that:
Under power amplifier load circuit is in short-circuit protection state, input a test signal in power amplifier load circuit, draw the data of power, impedance curve, when power amplifier load circuit power, impedance curve are normal, power amplifier load circuit starts.
4. power amplifier load faulty detection, reply a device, it is characterized in that comprising:
Current detection module: utilize the sampling of resistance tandem or Current Transformer to detect the electric current of power amplifier load circuit, current signal supply DSP/MCU module;
Voltage detection module: the dividing potential drop or the transformer pressure-reducing principle that utilize resistance, supply DSP/MCU module after the voltage signal step-down of power amplifier load circuit;
DSP/MCU module: use the dsp chip of band MCU function or the MCU chip of band A/D input port, the signal that received current detection module and voltage detection module are sent here, through inner computing, draw impedance curve data, power data, obtain failure message with this.
5. the detection of power amplifier load faulty as claimed in claim 4, reply device, is characterized in that:
Also comprise measuring signal generator, test signal miniwatt amplification module and change-over switch;
Described measuring signal generator is integrated in described DSP/MCU module, and is electrically connected to power amplifier load circuit by test signal miniwatt amplification module and change-over switch.
6. the detection of power amplifier load faulty as claimed in claim 4, reply device, is characterized in that:
Also comprise key-press module, described key-press module is electrically connected with described DSP/MCU module, and for setting power amplifier parameter, or manual triggers detects load parameter.
7. the detection of power amplifier load faulty as claimed in claim 4, reply device, is characterized in that:
Also comprise communication module, described communication module is electrically connected with described DSP/MCU module, for the data upload DSP/MCU module sent here to other machine.
8. the detection of power amplifier load faulty as claimed in claim 5, reply device, is characterized in that:
The test signal that described measuring signal generator sends is swept-frequency signal or stairstep signal.
9. the detection of power amplifier load faulty as claimed in claim 5, reply device, is characterized in that:
The frequency test signal that described measuring signal generator sends is 20Hz ~ 20KHz.
10. the detection of power amplifier load faulty as claimed in claim 5, reply device, is characterized in that:
The test signal that described measuring signal generator sends is pink noise signal.
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| CN201510128272.4A CN104698333A (en) | 2015-03-23 | 2015-03-23 | Method and device for detecting and handling load faults of power amplifier |
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| CN201510128272.4A CN104698333A (en) | 2015-03-23 | 2015-03-23 | Method and device for detecting and handling load faults of power amplifier |
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| CN201510128272.4A Pending CN104698333A (en) | 2015-03-23 | 2015-03-23 | Method and device for detecting and handling load faults of power amplifier |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105721986A (en) * | 2016-05-06 | 2016-06-29 | 深圳精拓创新科技有限公司 | Power amplifier circuit and loudspeaker system |
| CN105939178A (en) * | 2016-06-21 | 2016-09-14 | 新疆维吾尔自治区广播电影电视局节目传输中心 | System and method for input audio switching and broadcasting state monitoring of frequency modulation transmitter |
| CN106532654A (en) * | 2016-10-19 | 2017-03-22 | 成都言行果科技有限公司 | Single-trigger timer-based overload protection circuit |
| CN107124147A (en) * | 2017-06-20 | 2017-09-01 | 北京贝能达信息技术股份有限公司 | The constant-pressure type power amplifier and control method of detectable program circuit load condition |
| CN107438222A (en) * | 2016-05-26 | 2017-12-05 | 沈阳好灵通电子有限公司 | It is a kind of to break and short-circuit detecting circuit and method towards earphone/headset loudspeaker |
| CN108362943A (en) * | 2017-12-30 | 2018-08-03 | 广州市迪士普音响科技有限公司 | A kind of multi-channel power amplifier detection device |
| CN108880497A (en) * | 2018-09-10 | 2018-11-23 | 四川湖山电器股份有限公司 | A kind of self-adapting load audio power amplifying circuit |
| CN108988808A (en) * | 2018-07-13 | 2018-12-11 | 深圳市东微智能科技股份有限公司 | The adjusting method of audio-frequency power amplifier, audio devices and audio-frequency power amplifier |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN109429139A (en) * | 2017-08-24 | 2019-03-05 | 霍尼韦尔腾高电子系统（广州）有限公司 | Real-time and non real-time detection method, device and the broadcast system of loudspeaker subregion |
| CN110968350A (en) * | 2018-09-30 | 2020-04-07 | 成都鼎桥通信技术有限公司 | Power amplifier control method and device |
| CN112180147A (en) * | 2020-09-25 | 2021-01-05 | 加特兰微电子科技(上海)有限公司 | Power amplifier output impedance abnormity detection method, detection device and related device |
| WO2021135234A1 (en) * | 2019-12-31 | 2021-07-08 | 广州励丰文化科技股份有限公司 | Speaker unit identification method and device |
| CN113691225A (en) * | 2021-09-26 | 2021-11-23 | 中科长城海洋信息系统有限公司长沙分公司 | Power amplifier with online impedance monitoring function and adjusting method thereof |
| CN113809993A (en) * | 2021-11-18 | 2021-12-17 | 成都市卫莱科技有限公司 | Working signal monitoring control device, system and method for power amplifier |
| CN114727187A (en) * | 2022-04-02 | 2022-07-08 | 头领科技（昆山）有限公司 | Audio output device state detection chip and earphone |
| CN117520963A (en) * | 2024-01-03 | 2024-02-06 | 广州市迪声音响有限公司 | Power amplifier protection method and system based on output power real-time monitoring |
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| CN105721986A (en) * | 2016-05-06 | 2016-06-29 | 深圳精拓创新科技有限公司 | Power amplifier circuit and loudspeaker system |
| CN105721986B (en) * | 2016-05-06 | 2019-08-27 | 深圳精拓创新科技有限公司 | Power amplifier and speaker system |
| CN107438222A (en) * | 2016-05-26 | 2017-12-05 | 沈阳好灵通电子有限公司 | It is a kind of to break and short-circuit detecting circuit and method towards earphone/headset loudspeaker |
| CN105939178A (en) * | 2016-06-21 | 2016-09-14 | 新疆维吾尔自治区广播电影电视局节目传输中心 | System and method for input audio switching and broadcasting state monitoring of frequency modulation transmitter |
| CN106532654A (en) * | 2016-10-19 | 2017-03-22 | 成都言行果科技有限公司 | Single-trigger timer-based overload protection circuit |
| CN107124147A (en) * | 2017-06-20 | 2017-09-01 | 北京贝能达信息技术股份有限公司 | The constant-pressure type power amplifier and control method of detectable program circuit load condition |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN109429139A (en) * | 2017-08-24 | 2019-03-05 | 霍尼韦尔腾高电子系统（广州）有限公司 | Real-time and non real-time detection method, device and the broadcast system of loudspeaker subregion |
| CN109429139B (en) * | 2017-08-24 | 2021-06-15 | 霍尼韦尔腾高电子系统（广州）有限公司 | Real-time and non-real-time detection method and device for loudspeaker partition and broadcasting system |
| CN108362943A (en) * | 2017-12-30 | 2018-08-03 | 广州市迪士普音响科技有限公司 | A kind of multi-channel power amplifier detection device |
| CN108988808A (en) * | 2018-07-13 | 2018-12-11 | 深圳市东微智能科技股份有限公司 | The adjusting method of audio-frequency power amplifier, audio devices and audio-frequency power amplifier |
| CN108880497B (en) * | 2018-09-10 | 2023-08-29 | 四川湖山电器股份有限公司 | Self-adaptive load audio power amplifying circuit |
| CN108880497A (en) * | 2018-09-10 | 2018-11-23 | 四川湖山电器股份有限公司 | A kind of self-adapting load audio power amplifying circuit |
| CN110968350A (en) * | 2018-09-30 | 2020-04-07 | 成都鼎桥通信技术有限公司 | Power amplifier control method and device |
| WO2021135234A1 (en) * | 2019-12-31 | 2021-07-08 | 广州励丰文化科技股份有限公司 | Speaker unit identification method and device |
| CN112180147A (en) * | 2020-09-25 | 2021-01-05 | 加特兰微电子科技(上海)有限公司 | Power amplifier output impedance abnormity detection method, detection device and related device |
| CN112180147B (en) * | 2020-09-25 | 2022-12-23 | 加特兰微电子科技(上海)有限公司 | Power amplifier output impedance abnormity detection method, detection device and related device |
| CN113691225A (en) * | 2021-09-26 | 2021-11-23 | 中科长城海洋信息系统有限公司长沙分公司 | Power amplifier with online impedance monitoring function and adjusting method thereof |
| CN113691225B (en) * | 2021-09-26 | 2024-06-04 | 中科长城海洋信息系统有限公司长沙分公司 | Power amplifier with on-line impedance monitoring function and adjusting method thereof |
| CN113809993A (en) * | 2021-11-18 | 2021-12-17 | 成都市卫莱科技有限公司 | Working signal monitoring control device, system and method for power amplifier |
| CN114727187A (en) * | 2022-04-02 | 2022-07-08 | 头领科技（昆山）有限公司 | Audio output device state detection chip and earphone |
| CN117520963A (en) * | 2024-01-03 | 2024-02-06 | 广州市迪声音响有限公司 | Power amplifier protection method and system based on output power real-time monitoring |
| CN117520963B (en) * | 2024-01-03 | 2024-03-19 | 广州市迪声音响有限公司 | Power amplifier protection method and system based on output power real-time monitoring |
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Application publication date: 20150610 |
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